discourse/lib/topic_view.rb

270 lines
7.5 KiB
Ruby

require_dependency 'guardian'
require_dependency 'topic_query'
class TopicView
attr_accessor :topic, :min, :max, :draft, :draft_key, :draft_sequence, :posts
def initialize(topic_id, user=nil, options={})
@topic = find_topic(topic_id)
raise Discourse::NotFound if @topic.blank?
# Special case: If the topic is private and the user isn't logged in, ask them
# to log in!
if @topic.present? and @topic.private_message? and user.blank?
raise Discourse::NotLoggedIn.new
end
Guardian.new(user).ensure_can_see!(@topic)
@min, @max = 1, SiteSetting.posts_per_page
@post_number, @page = options[:post_number], options[:page]
@posts = @topic.posts
@posts = @posts.with_deleted if user.try(:admin?)
@posts = @posts.best_of if options[:best_of].present?
if options[:username_filters].present?
usernames = options[:username_filters].map{|u| u.downcase}
@posts = @posts.where('post_number = 1 or user_id in (select u.id from users u where username_lower in (?))', usernames)
end
@user = user
@initial_load = true
@all_posts = @posts
filter_posts(options)
@draft_key = @topic.draft_key
@draft_sequence = DraftSequence.current(user, @draft_key)
end
def canonical_path
path = @topic.relative_url
path << if @post_number
page = ((@post_number.to_i - 1) / SiteSetting.posts_per_page) + 1
(page > 1) ? "?page=#{page}" : ""
else
(@page && @page.to_i > 1) ? "?page=#{@page}" : ""
end
path
end
def next_page
last_post = @posts.last
if last_post.present? and (@topic.highest_post_number > last_post.post_number)
(@posts[0].post_number / SiteSetting.posts_per_page) + 1
end
end
def next_page_path
"#{@topic.relative_url}?page=#{next_page}"
end
def relative_url
@topic.relative_url
end
def title
@topic.title
end
def filter_posts(opts = {})
if opts[:post_number].present?
# Get posts near a post
filter_posts_near(opts[:post_number].to_i)
elsif opts[:posts_before].present?
filter_posts_before(opts[:posts_before].to_i)
elsif opts[:posts_after].present?
filter_posts_after(opts[:posts_after].to_i)
else
# No filter? Consider it a paged view, default to page 0 which is the first segment
filter_posts_paged(opts[:page].to_i)
end
end
# Filter to all posts near a particular post number
def filter_posts_near(post_number)
@min, @max = post_range(post_number)
filter_posts_in_range(@min, @max)
end
def post_numbers
@post_numbers ||= @posts.order(:post_number).pluck(:post_number)
end
def filter_posts_paged(page)
page ||= 0
min = (SiteSetting.posts_per_page * page)
max = min + SiteSetting.posts_per_page
max_val = (post_numbers.length - 1)
# If we're off the charts, return nil
return nil if min > max_val
# Pin max to the last post
max = max_val if max > max_val
filter_posts_in_range(post_numbers[min], post_numbers[max])
end
# Filter to all posts before a particular post number
def filter_posts_before(post_number)
@initial_load = false
@max = post_number - 1
@posts = @posts.reverse_order.where("post_number < ?", post_number)
@posts = @posts.includes(:topic).joins(:user).limit(SiteSetting.posts_per_page)
@min = @max - @posts.size
@min = 1 if @min < 1
end
# Filter to all posts after a particular post number
def filter_posts_after(post_number)
@initial_load = false
@min = post_number
@posts = @posts.regular_order.where("post_number > ?", post_number)
@posts = @posts.includes(:topic).joins(:user).limit(SiteSetting.posts_per_page)
@max = @min + @posts.size
end
def read?(post_number)
read_posts_set.include?(post_number)
end
def topic_user
@topic_user ||= begin
return nil if @user.blank?
@topic.topic_users.where(user_id: @user.id).first
end
end
def posts_count
@posts_count ||= Post.where(topic_id: @topic.id).group(:user_id).order('count_all desc').limit(24).count
end
def participants
@participants ||= begin
participants = {}
User.where(id: posts_count.map {|k,v| k}).each {|u| participants[u.id] = u}
participants
end
end
def all_post_actions
@all_post_actions ||= PostAction.counts_for(posts, @user)
end
def voted_in_topic?
return false
# all post_actions is not the way to do this, cut down on the query, roll it up into topic if we need it
@voted_in_topic ||= begin
return false unless all_post_actions.present?
all_post_actions.values.flatten.map {|ac| ac.keys}.flatten.include?(PostActionType.Types[:vote])
end
end
def post_action_visibility
@post_action_visibility ||= begin
result = []
PostActionType.Types.each do |k, v|
result << v if Guardian.new(@user).can_see_post_actors?(@topic, v)
end
result
end
end
def links
@links ||= @topic.links_grouped
end
def link_counts
@link_counts ||= TopicLinkClick.counts_for(@topic, posts)
end
# Binary search for closest value
def self.closest(array, target, min, max)
return min if max <= min
return max if (max - min) == 1
middle_idx = ((min + max) / 2).floor
middle_val = array[middle_idx]
return middle_idx if target == middle_val
return closest(array, target, min, middle_idx) if middle_val > target
return closest(array, target, middle_idx, max)
end
# Find a range of posts, allowing for gaps by deleted posts.
def post_range(post_number)
closest_index = TopicView.closest(post_numbers, post_number, 0, post_numbers.size - 1)
min_idx = closest_index - (SiteSetting.posts_per_page.to_f / 4).floor
min_idx = 0 if min_idx < 0
max_idx = min_idx + (SiteSetting.posts_per_page - 1)
if max_idx > (post_numbers.length - 1)
max_idx = post_numbers.length - 1
min_idx = max_idx - SiteSetting.posts_per_page
min_idx = 0 if min_idx < 0
end
[post_numbers[min_idx], post_numbers[max_idx]]
end
# Are we the initial page load? If so, we can return extra information like
# user post counts, etc.
def initial_load?
@initial_load
end
def suggested_topics
return nil if topic.private_message?
@suggested_topics ||= TopicQuery.new(@user).list_suggested_for(topic)
end
# This is pending a larger refactor, that allows custom orders
# for now we need to look for the highest_post_number in the stream
# the cache on topics is not correct if there are deleted posts at
# the end of the stream (for mods), nor is it correct for filtered
# streams
def highest_post_number
@highest_post_number ||= @all_posts.maximum(:post_number)
end
def recent_posts
@all_posts.by_newest.with_user.first(25)
end
protected
def read_posts_set
@read_posts_set ||= begin
result = Set.new
return result unless @user.present?
return result unless topic_user.present?
posts_max = @max > (topic_user.last_read_post_number || 1 ) ? (topic_user.last_read_post_number || 1) : @max
PostTiming.select(:post_number)
.where("topic_id = ? AND user_id = ? AND post_number BETWEEN ? AND ?",
@topic.id, @user.id, @min, posts_max)
.each {|t| result << t.post_number}
result
end
end
private
def filter_posts_in_range(min, max)
@min, @max = min, max
@posts = @posts.where("post_number between ? and ?", @min, @max).includes(:user).regular_order
end
def find_topic(topic_id)
Topic.where(id: topic_id).includes(:category).first
end
end